Duplicating machine



Patented Aug. 24, 1937 UNITED STATES ATENT FFltE Application June 15,

6 Claims.

The object of my invention is to provide a duplicating machine of simple, durable and inexpensive construction. More specifically, it is my object to provide a machine of this class in which the sheets of paper will be fed rapidly and accurately to the stencil and platen.

A further object is to provide an improved stop and guide device for the sheets of paper, to aid the operator in quickly and accurately feeding sheets of paper to the machine.

A further object is to provid-e improved and simplified means for detachably connecting the stencil holder with the rotatable shaft and for quickly and accurately aligning the stencil holder relative to the shaft.

In the accompanying drawing Figure l shows a top or plan View of my improved duplicating machine.

Figure 2 shows a vertical longitudinal sectional View of same.

Figure 3 shows a vertical transverse sectional View through the paper holding platform and illustrating the paper stop and guide device.

Figure 4 shows a perspective view of the stencil holder detached.

Figure 5 shows a detail sectional View illustrating the means for detachably centering the stencil holder relative to the end plates; and

Figure 6 shows an end elevation of the side paper platform.

Referring to the accompanying drawing I have used the reference numeral l to indicate generally the frame of the machine. This frame has at one end two upwardly extended arms i i, their upper ends being extended over the body portion of the frame, as shown by dotted lines in Figure 2, thereby forming a paper passageway from the side of the machine to the side; of the frame under the arms ll. On the end of the frame opposite the arms l l there is fixed a paper platform i 2 ex" tending the full width of the frame and to a point near the ends of the arms l l.

An auxiliary paper platform is provided and comprises a platform I3, made of sheet metal and having at its ends downwardly extended flanges ifi to engage the side of the paper plat form I2. At the outer end there is an upwardly extended flange l5, and a rod lil is hooked to this flange and pivotally mounted in the adjacent arm il so that this auxiliary paper platform may be readily and easily detached. The two platforms l2 and i3 constitute a paper platform.

Theroller platen I 'l is mounted in the ordinary manner on two arms i8 pivotally connected at it and extended upwardly, and each having its upper end connected to a spring 20 fixed to the frame for yieldingly holding the arms at their upper limit and holding the roller platen at its upper limit. The upward limit of the movement 1936, Serial N0. 85,243

of these arms i8 is controlled by a screw 2i en gaging a lug 22 on the frame.

For moving the roller platen downwardly to an inoperative position I have provided a shaft 23 mounted to the frame and having a handle 2d at 5 one end and an varm 25 to engage the upper edge of the arm i8. By moving the handle upwardly from the position shown in Figure 2 the arm 25 is moved downwardly to lower the roller platen, and when the handle 2d is in the position shown in Figure 2 the spring 2t holds the roller platen yieldably at its upper limit.

Mounted in the arms li is a shaft 25 having a crank 2'! at one end. Fixed to'this shaft are two end plates 28, and these end plates 'are formed with tapered openings 2li, as shown in Figure 5.

The ink pad and stencil holder shown in Figure Il comp-rises two end members til and a cylindrical perforated body portion 3l, and an ink pad and stencil 32 which is mounted upon the outer nur face of the body portion 3l and yieldingly held in position thereon by a spring 33.

Seated in each of the endy plates it is a screw 34 having a tapered body portion Sli, the taper corresponding to the taper of the openings 39. 25 I'hese end plates 36 are formed with slots 35 designed to receive the shaft The entire ink pad and stencil holder is of cylindrical shape, but one side is cut olf so that when in the position shown in Figure 2 the inl: pad and stencil holder is widely spaced apart from the paper platform l2.

For the purpose of stopping guiding the sheets of paper I have provided a stop and guide plate 3l having at one edge an upward-ly extended flange it@ and at another edge an upwardly extended flange 38, This stop and guide plate is provided with a slot extended transversely through it, as shown in Figure 2, and through this slot there is extended a hat rod 40 of resilient material. -nis rod iii downwardly inclined end all to engage the side of the paper platform i2, and at its other end there is a downwardly extending portion l2 adjacent the opposite side of the paper platform. 45 Mounted on this downwardly inclined end 52 is a screw t3, and mounted upon the rod fill is a flexible pad ill made of leather or the like. In operation, when this screw 3 is moved outwardly the rod lil becomes substantially straight and the stop and guide plate may also be. freely moved longitudinally of the paper platform. When, however, the screw it is moved inwardly, 'the outer end of the rod l0 is inclined upwardly, as shown in Figure 3, which forces the central portion of the rod lli downwardly, bringing the plate 31 into frictional binding engagement with the paper platform above.`

In practice I have found with my improved duplicating machine that I can attain greater and accurately speed and do more accurate work than with the duplicators now in common use. In practice I place the blank sheets of paper upon the paper platform I3, and then I adjust the stop and guide device to the proper position for the sheets selected and for the character of the stencil used. Then I may, with the left hand, grasp the sheets of paper and move them laterally and forwardly across the paper platform I2 along the dotted lines 45, as shown in Figure l. Ihis is possible because of the paper passageway formed in the adjacent side of the frame and because the stencil holder is in position widely spaced apart from the roller platen, and when in this position the paper projects over the roller platen so that when the handle crank 21 is turned, the stencil will engage the paper and grip it against the roller platen and thereby complete the printing upon the paper in the ordinary manner. However, by this arrangement only one movement in a substantially straight line of the paper is required to be done by the operators left hand. I-Ieretofore it has been necessary to feed the sheets of paper first forwardly into the machine and then backwardly against the paper guide, and again forwardly into position over the platen, and this requires additional time. With my machine a single movement of the paper in a straight line is all that is required, and when that is done, the paper is accurately guided and held in position relative to the platen.

With my improved paper stop and guide device I have demonstrated in use that when the screw 43 is loosened, the plate 3'! can be readily and easily moved both laterally and longitudinally to the desired position, and then when the screw 43 is tightened it is firmly clamped in that position.

I have further demonstrated in practice that with my improved machine I can rapidly and accurately reproduce printing in several colors, and I do this as follows: I provide several of the ink pads and stencil holders, place one color of ink and the stencil in one holder and the remainder of the stenciled design on another ink pad and stencil holder to which another color of ink is applied. I then proceed in the ordinary manner of duplicating machines, to print on the sheets of paper from the first stencil, and then remove the first stencil and substitute the second stencil with a different colored ink, and run the paper through the machine the second time. This obviates the necessity of removing one ink pad and stencil holder and cleaning the stencil holder before applying the second stencil and ink pad with the different color, as is now the general practice.

I claim as my invention:

l. A duplicating machine, comprising a frame, a rotary ink pad and stencil carrier mounted in the frame, a roller platen mounted in the frame in position to hold paper against the stencil, a paper platform carried by the frame and extending from the position where it will support sheets of paper on one side of the frame and during their movement from said position to feeding position, the frame being so shaped as to permit said movement of sheets of paper in a straight line, and said ink pad and stencil holder being so shaped that in one position of its rotary movement it will be widely spaced above the roller to permit said movement of the sheets of paper.

2. A duplicating machine, comprising a frame, a roller platen carried by the frame, the side of the frame directly above the platen being formed with a passageway for sheets of paper, a rotary ink pad and stencil carrier mounted in the frame above the platen and being of segmental form whereby when in one position of its movement it will be widely spaced above the platen, and a platform for paper sheets extending from the position for supporting sheets of paper at the side of the frame adjacent said paper passageway to paper feeding position at the front of the machine.

3. A duplicating machine, comprising a frame, a roller platen carried by the frame, the side of the frame directly above the platen being formed with a passageway for sheets of paper, a rotary ink pad and stencil carrier mounted in the frame above the platen and being of segmental form whereby when in one position of its movement it will be widely spaced above the platen, and a platform for paper sheets extending from the position for supporting sheets of paper at the side of the frame adjacent said paper passageway to paper feeding position at the front of the machine, the portion of the paper platform at the side of the frame having its inner end resting upon the frame and a rod for supporting the outer end of said platform to the frame, said rod being detachably connected at one end.

4. In a duplicating machine, the combination of a rotatable cylinder containing an ink pad and a stencil, a stationary paper platform, a paper stop and guide device, comprising a flat plate having a stop and guide flange extended upwardly, and also having an opening extended through it transversely of the platform, a resilient rod slidingly mounted on the platform and having one end inclined downwardly at one edge of the platform, and a means carried by said end of the rod for forcing it away from the edge of the platform and thereby bending the central portion of the rod downwardly to force the plate into binding frictional engagement with the platform.

5. In a duplicating machine, the combination of a rotatable cylinder containing an ink pad and a stencil, a stationary paper platform and apaper stop and guide device, comprising a flat plate having a stop and guide flange extended upwardly, and also having an opening extended through it transversely of the platform, a resilient rod slidingly mounted on the platform and having one end inclined downwardly at one edge of the platform. and a means carried by said end of the rod for forcing it away from the edge of the platform and thereby bending the central portion of the rod downwardly to force the plate into binding frictional engagement with the platform, said latter means comprising a yielding pad carried by the rod and a screw seated in the downwardly inclined en-d of the rod for forcing the pad against the platform.

6. In a duplicating machine, the combination of a shaft, two supporting plates carried by the shaft and each having a tapered opening, a stencil holder detachably mounted between said plates, tapered set screws seated in the stencil holder and extending outwardly through said tapered openings and whereby upon tightening the screws the stencil holder will be accurately positioned within the supporting plates.

ALFRED E. GOODWIN. 

